class Person{
    constructor(_name,_age){
        this.name = _name ;
        this.age = _age ;
    }
    basic_introduce(){
        return `My name is ${this.name}. I am ${this.age} years old.`
    }
    introduce(){
        return this.basic_introduce() ;
    }
}
module.exports = Person ;
// let p1 = new Person('zhang',23);
// console.log(p1.introduce());
// let s1 = new Student('zhanghang',18,2);
// console.log(s1.introduce());
